1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2010 Lennart Poettering
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 typedef struct Unit Unit;
28 typedef struct UnitVTable UnitVTable;
29 typedef enum UnitActiveState UnitActiveState;
30 typedef enum UnitDependency UnitDependency;
31 typedef struct UnitRef UnitRef;
32 typedef struct UnitStatusMessageFormats UnitStatusMessageFormats;
37 #include "socket-util.h"
39 #include "condition.h"
41 #include "unit-name.h"
43 enum UnitActiveState {
50 _UNIT_ACTIVE_STATE_MAX,
51 _UNIT_ACTIVE_STATE_INVALID = -1
54 static inline bool UNIT_IS_ACTIVE_OR_RELOADING(UnitActiveState t) {
55 return t == UNIT_ACTIVE || t == UNIT_RELOADING;
58 static inline bool UNIT_IS_ACTIVE_OR_ACTIVATING(UnitActiveState t) {
59 return t == UNIT_ACTIVE || t == UNIT_ACTIVATING || t == UNIT_RELOADING;
62 static inline bool UNIT_IS_INACTIVE_OR_DEACTIVATING(UnitActiveState t) {
63 return t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_DEACTIVATING;
66 static inline bool UNIT_IS_INACTIVE_OR_FAILED(UnitActiveState t) {
67 return t == UNIT_INACTIVE || t == UNIT_FAILED;
71 /* Positive dependencies */
73 UNIT_REQUIRES_OVERRIDABLE,
75 UNIT_REQUISITE_OVERRIDABLE,
79 /* Inverse of the above */
80 UNIT_REQUIRED_BY, /* inverse of 'requires' and 'requisite' is 'required_by' */
81 UNIT_REQUIRED_BY_OVERRIDABLE, /* inverse of 'requires_overridable' and 'requisite_overridable' is 'soft_required_by' */
82 UNIT_WANTED_BY, /* inverse of 'wants' */
83 UNIT_BOUND_BY, /* inverse of 'binds_to' */
85 /* Negative dependencies */
86 UNIT_CONFLICTS, /* inverse of 'conflicts' is 'conflicted_by' */
90 UNIT_BEFORE, /* inverse of 'before' is 'after' and vice versa */
96 /* Triggers (i.e. a socket triggers a service) */
100 /* Propagate reloads */
101 UNIT_PROPAGATES_RELOAD_TO,
102 UNIT_RELOAD_PROPAGATED_FROM,
104 /* Reference information for GC logic */
105 UNIT_REFERENCES, /* Inverse of 'references' is 'referenced_by' */
108 _UNIT_DEPENDENCY_MAX,
109 _UNIT_DEPENDENCY_INVALID = -1
115 #include "cgroup-attr.h"
121 UnitLoadState load_state;
124 char *id; /* One name is special because we use it for identification. Points to an entry in the names set */
128 Set *dependencies[_UNIT_DEPENDENCY_MAX];
130 char **requires_mounts_for;
133 char **documentation;
135 char *fragment_path; /* if loaded from a config file this is the primary path to it */
136 char *source_path; /* if converted, the source file */
137 usec_t fragment_mtime;
140 /* If there is something to do with this unit, then this is the installed job for it */
143 /* JOB_NOP jobs are special and can be installed without disturbing the real job. */
148 /* References to this */
149 LIST_HEAD(UnitRef, refs);
151 /* Conditions to check */
152 LIST_HEAD(Condition, conditions);
154 dual_timestamp condition_timestamp;
156 dual_timestamp inactive_exit_timestamp;
157 dual_timestamp active_enter_timestamp;
158 dual_timestamp active_exit_timestamp;
159 dual_timestamp inactive_enter_timestamp;
161 /* Counterparts in the cgroup filesystem */
162 CGroupBonding *cgroup_bondings;
163 CGroupAttribute *cgroup_attributes;
166 LIST_FIELDS(Unit, units_by_type);
168 /* All units which have requires_mounts_for set */
169 LIST_FIELDS(Unit, has_requires_mounts_for);
172 LIST_FIELDS(Unit, load_queue);
175 LIST_FIELDS(Unit, dbus_queue);
178 LIST_FIELDS(Unit, cleanup_queue);
181 LIST_FIELDS(Unit, gc_queue);
183 /* Used during GC sweeps */
186 /* When deserializing, temporarily store the job type for this
187 * unit here, if there was a job scheduled.
188 * Only for deserializing from a legacy version. New style uses full
189 * serialized jobs. */
190 int deserialized_job; /* This is actually of type JobType */
192 /* Error code when we didn't manage to load the unit (negative) */
195 /* Cached unit file state */
196 UnitFileState unit_file_state;
198 /* Garbage collect us we nobody wants or requires us anymore */
199 bool stop_when_unneeded;
201 /* Create default dependencies */
202 bool default_dependencies;
204 /* Refuse manual starting, allow starting only indirectly via dependency. */
205 bool refuse_manual_start;
207 /* Don't allow the user to stop this unit manually, allow stopping only indirectly via dependency. */
208 bool refuse_manual_stop;
210 /* Allow isolation requests */
213 /* Isolate OnFailure unit */
214 bool on_failure_isolate;
216 /* Ignore this unit when isolating */
217 bool ignore_on_isolate;
219 /* Ignore this unit when snapshotting */
220 bool ignore_on_snapshot;
222 /* Did the last condition check succeed? */
223 bool condition_result;
225 bool in_load_queue:1;
226 bool in_dbus_queue:1;
227 bool in_cleanup_queue:1;
230 bool sent_dbus_new_signal:1;
238 /* Keeps tracks of references to a unit. This is useful so
239 * that we can merge two units if necessary and correct all
240 * references to them */
243 LIST_FIELDS(UnitRef, refs);
246 struct UnitStatusMessageFormats {
247 const char *starting_stopping[2];
248 const char *finished_start_job[_JOB_RESULT_MAX];
249 const char *finished_stop_job[_JOB_RESULT_MAX];
258 #include "automount.h"
259 #include "snapshot.h"
264 /* How much memory does an object of this unit type need */
267 /* Config file sections this unit type understands, separated
269 const char *sections;
271 /* This should reset all type-specific variables. This should
272 * not allocate memory, and is called with zero-initialized
273 * data. It should hence only initialize variables that need
275 void (*init)(Unit *u);
277 /* This should free all type-specific variables. It should be
279 void (*done)(Unit *u);
281 /* Actually load data from disk. This may fail, and should set
282 * load_state to UNIT_LOADED, UNIT_MERGED or leave it at
283 * UNIT_STUB if no configuration could be found. */
284 int (*load)(Unit *u);
286 /* If a a lot of units got created via enumerate(), this is
287 * where to actually set the state and call unit_notify(). */
288 int (*coldplug)(Unit *u);
290 void (*dump)(Unit *u, FILE *f, const char *prefix);
292 int (*start)(Unit *u);
293 int (*stop)(Unit *u);
294 int (*reload)(Unit *u);
296 int (*kill)(Unit *u, KillWho w, KillMode m, int signo, DBusError *error);
298 bool (*can_reload)(Unit *u);
300 /* Write all data that cannot be restored from other sources
301 * away using unit_serialize_item() */
302 int (*serialize)(Unit *u, FILE *f, FDSet *fds);
304 /* Restore one item from the serialization */
305 int (*deserialize_item)(Unit *u, const char *key, const char *data, FDSet *fds);
307 /* Boils down the more complex internal state of this unit to
308 * a simpler one that the engine can understand */
309 UnitActiveState (*active_state)(Unit *u);
311 /* Returns the substate specific to this unit type as
312 * string. This is purely information so that we can give the
313 * user a more fine grained explanation in which actual state a
315 const char* (*sub_state_to_string)(Unit *u);
317 /* Return true when there is reason to keep this entry around
318 * even nothing references it and it isn't active in any
320 bool (*check_gc)(Unit *u);
322 /* Return true when this unit is suitable for snapshotting */
323 bool (*check_snapshot)(Unit *u);
325 void (*fd_event)(Unit *u, int fd, uint32_t events, Watch *w);
326 void (*sigchld_event)(Unit *u, pid_t pid, int code, int status);
327 void (*timer_event)(Unit *u, uint64_t n_elapsed, Watch *w);
329 /* Reset failed state if we are in failed state */
330 void (*reset_failed)(Unit *u);
332 /* Called whenever any of the cgroups this unit watches for
334 void (*cgroup_notify_empty)(Unit *u);
336 /* Called whenever a process of this unit sends us a message */
337 void (*notify_message)(Unit *u, pid_t pid, char **tags);
339 /* Called whenever a name thus Unit registered for comes or
341 void (*bus_name_owner_change)(Unit *u, const char *name, const char *old_owner, const char *new_owner);
343 /* Called whenever a bus PID lookup finishes */
344 void (*bus_query_pid_done)(Unit *u, const char *name, pid_t pid);
346 /* Called for each message received on the bus */
347 DBusHandlerResult (*bus_message_handler)(Unit *u, DBusConnection *c, DBusMessage *message);
349 /* Return the unit this unit is following */
350 Unit *(*following)(Unit *u);
352 /* Return the set of units that are following each other */
353 int (*following_set)(Unit *u, Set **s);
355 /* This is called for each unit type and should be used to
356 * enumerate existing devices and load them. However,
357 * everything that is loaded here should still stay in
358 * inactive state. It is the job of the coldplug() call above
359 * to put the units into the initial state. */
360 int (*enumerate)(Manager *m);
362 /* Type specific cleanups. */
363 void (*shutdown)(Manager *m);
365 /* When sending out PropertiesChanged signal, which properties
366 * shall be invalidated? This is a NUL separated list of
367 * strings, to minimize relocations a little. */
368 const char *bus_invalidating_properties;
370 /* The interface name */
371 const char *bus_interface;
373 UnitStatusMessageFormats status_message_formats;
375 /* Can units of this type have multiple names? */
378 /* Instances make no sense for this type */
381 /* Exclude from automatic gc */
385 extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX];
387 #define UNIT_VTABLE(u) unit_vtable[(u)->type]
389 /* For casting a unit into the various unit types */
390 #define DEFINE_CAST(UPPERCASE, MixedCase) \
391 static inline MixedCase* UPPERCASE(Unit *u) { \
392 if (_unlikely_(!u || u->type != UNIT_##UPPERCASE)) \
395 return (MixedCase*) u; \
398 /* For casting the various unit types into a unit */
399 #define UNIT(u) (&(u)->meta)
401 DEFINE_CAST(SOCKET, Socket);
402 DEFINE_CAST(TIMER, Timer);
403 DEFINE_CAST(SERVICE, Service);
404 DEFINE_CAST(TARGET, Target);
405 DEFINE_CAST(DEVICE, Device);
406 DEFINE_CAST(MOUNT, Mount);
407 DEFINE_CAST(AUTOMOUNT, Automount);
408 DEFINE_CAST(SNAPSHOT, Snapshot);
409 DEFINE_CAST(SWAP, Swap);
410 DEFINE_CAST(PATH, Path);
412 Unit *unit_new(Manager *m, size_t size);
413 void unit_free(Unit *u);
415 int unit_add_name(Unit *u, const char *name);
417 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference);
418 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference);
420 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
421 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
423 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
424 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
426 int unit_add_exec_dependencies(Unit *u, ExecContext *c);
428 int unit_add_cgroup(Unit *u, CGroupBonding *b);
429 int unit_add_cgroup_from_text(Unit *u, const char *name);
430 int unit_add_default_cgroups(Unit *u);
431 CGroupBonding* unit_get_default_cgroup(Unit *u);
432 int unit_add_cgroup_attribute(Unit *u, const char *controller, const char *name, const char *value, CGroupAttributeMapCallback map_callback);
434 int unit_choose_id(Unit *u, const char *name);
435 int unit_set_description(Unit *u, const char *description);
437 bool unit_check_gc(Unit *u);
439 void unit_add_to_load_queue(Unit *u);
440 void unit_add_to_dbus_queue(Unit *u);
441 void unit_add_to_cleanup_queue(Unit *u);
442 void unit_add_to_gc_queue(Unit *u);
444 int unit_merge(Unit *u, Unit *other);
445 int unit_merge_by_name(Unit *u, const char *other);
447 Unit *unit_follow_merge(Unit *u);
449 int unit_load_fragment_and_dropin(Unit *u);
450 int unit_load_fragment_and_dropin_optional(Unit *u);
451 int unit_load(Unit *unit);
453 const char *unit_description(Unit *u);
455 bool unit_has_name(Unit *u, const char *name);
457 UnitActiveState unit_active_state(Unit *u);
459 const char* unit_sub_state_to_string(Unit *u);
461 void unit_dump(Unit *u, FILE *f, const char *prefix);
463 bool unit_can_reload(Unit *u);
464 bool unit_can_start(Unit *u);
465 bool unit_can_isolate(Unit *u);
467 int unit_start(Unit *u);
468 int unit_stop(Unit *u);
469 int unit_reload(Unit *u);
471 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error);
473 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success);
475 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w);
476 void unit_unwatch_fd(Unit *u, Watch *w);
478 int unit_watch_pid(Unit *u, pid_t pid);
479 void unit_unwatch_pid(Unit *u, pid_t pid);
481 int unit_watch_timer(Unit *u, usec_t delay, Watch *w);
482 void unit_unwatch_timer(Unit *u, Watch *w);
484 int unit_watch_bus_name(Unit *u, const char *name);
485 void unit_unwatch_bus_name(Unit *u, const char *name);
487 bool unit_job_is_applicable(Unit *u, JobType j);
489 int set_unit_path(const char *p);
491 char *unit_dbus_path(Unit *u);
493 int unit_load_related_unit(Unit *u, const char *type, Unit **_found);
494 int unit_get_related_unit(Unit *u, const char *type, Unit **_found);
496 char *unit_name_printf(Unit *u, const char* text);
497 char *unit_full_printf(Unit *u, const char *text);
498 char **unit_full_printf_strv(Unit *u, char **l);
500 bool unit_can_serialize(Unit *u);
501 int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs);
502 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *value, ...) _printf_attr_(4,5);
503 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value);
504 int unit_deserialize(Unit *u, FILE *f, FDSet *fds);
506 int unit_add_node_link(Unit *u, const char *what, bool wants);
508 int unit_coldplug(Unit *u);
510 void unit_status_printf(Unit *u, const char *status, const char *format, ...);
512 bool unit_need_daemon_reload(Unit *u);
514 void unit_reset_failed(Unit *u);
516 Unit *unit_following(Unit *u);
518 bool unit_pending_inactive(Unit *u);
519 bool unit_pending_active(Unit *u);
521 int unit_add_default_target_dependency(Unit *u, Unit *target);
523 int unit_following_set(Unit *u, Set **s);
525 void unit_trigger_on_failure(Unit *u);
527 bool unit_condition_test(Unit *u);
529 UnitFileState unit_get_unit_file_state(Unit *u);
531 Unit* unit_ref_set(UnitRef *ref, Unit *u);
532 void unit_ref_unset(UnitRef *ref);
534 #define UNIT_DEREF(ref) ((ref).unit)
536 int unit_add_one_mount_link(Unit *u, Mount *m);
537 int unit_add_mount_links(Unit *u);
539 int unit_patch_working_directory(Unit *u, ExecContext *c);
541 const char *unit_active_state_to_string(UnitActiveState i);
542 UnitActiveState unit_active_state_from_string(const char *s);
544 const char *unit_dependency_to_string(UnitDependency i);
545 UnitDependency unit_dependency_from_string(const char *s);